Exit 15 on I-290 is for I-294 and I-88, forming the triangle of roads east of I-294.
The ramp from I-294 SB to I-290 EB is well-built, so that traffic doesn't have to slow all the way down to 20 or 30 mph to get around a loop ramp; its counterpart, I-294 NB to I-290 WB, does not have this advantage.
NB on I-294, there is an offramp from the overpass over I-88; this ramp goes around the outside of the I-88 onramp, and allows traffic to use the exit to I-290 without weaving with traffic entering from I-88.
Exits are not numbered on the I-294 or I-90 tollways; this is exit 77 on I-90 WB, and exit 2 on I-190.
I-190 and I-294: This part of the junction functions as if it were three-quarters of a cloverleaf, missing the ramps to provide movements from I-294 SB to I-190 EB and from I-190 WB to I-294 NB.
Finally, the ramp from I-294 NB to I-190 EB is missing; it was replaced with a ramp from I-294 NB to I-90 EB, so that it would pass through the I-90 mainline toll booth.
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